Tool retainer for portable power driven tools



Dec. 14, 1937.

a o o o r J F. HAAS TOOL RETAINER FOR PORTABLE POWER DRIVEN TOOLS FiledMay 19, 1934 35 :1 g0 57 Z35 a0 55 5Q 14; v H as J 2 Z1 y 217 g I ll g5J5 ""1 J6 Patented Dec. 14, 1937 'rooL' RETAINER Fo PORTABLE POWERDRIVEN 'rooiis Joseph F. Haas, Forest Park, Ill., assignor to WodackElectric Tool Corporation, Chicago,

111., a corporation of Illinois Application May 19, 1934, Serial No.726,515

5 Claims.

The invention relates generally to portable power-operated tools andmore particularly to a tool retaining device therefor.

The primary object of the invention is to provide a tool retainer fordrills, hammers and the like, which is of simple construction andadapted for easy and convenient manipulation.

Another object is to provide a tool retainer having an improved form oflocking sleeve advantageously associated with the barrel of the tool andthe retaining member mounted thereon.

Another object is to provide a device of this character having a lockingsleeve which is resiliently urged into locking position, whereby tosimplify the insertion and removal of the tool.-

A further object is to provide a resilient support for the retaining'member to cushion the shock on the retaining member of the tool in itsreciprocation.

Other objects and advantages will become apparent from the followingdescription taken in connection with the accompanying drawing, in

which: 1

Figure 1 is a side elevation of hammer embodying the features of theinvention.

Fig. 2 is an enlarged fragmentary sectional view taken on the line 2-2.

Fig. 3 is an enlarged fragmentary perspective view of a part of thehammer shown in Fig. 1.

Fig. l is an enlarged fragmentary perspective view of another part ofthe hammer shown in Fig. 1.

Fig. 5 is a fragmentary sectional View similar to Fig. 2 but showing amodified form of hammer.

My invention is applicable to portable power driven tools of the typeemploying a reciprocatory tool element, and I have herein shown by wayof illustration an electric hammer having a main body portion 6 equippedwith'an attach ment 1 embodying a reciprocating mechanism for applyingsuccessive power impulses to a shank 8 of a star drill 9. Saidattachment 1 is constructed to provide a barrel ID for receiving theshank 8 of the drill 9, and my invention particularly concerns theprovision of means of an advantageous character for retaining the drill9 in operative position in the barrel Ill.

Of primary importance in the provision ,of

such means is simplicity of construction and ease of manipulation.Accordingly, it is desirable that the number of parts be reduced to aminimum and that the number of manipulations necessary to effect theinsertion and removal of the tool be small so as to simplify theseoperations.

Furthermore, it is desirable that the parts he I 7 associated in acompact relation so as to avoid undue bulk and at the same time providea strong and rugged structure.

a To obtain these advantages, I employ a single arcuate retaining memberH which is capable of being positioned in operative relation to the endi of the barrel in by a mere lateral movement of the member, and Iprovide a simple locking means for this retaining member comprising asingle sleeve I2 slidable directly on the end of the barrel andpreferably spring-pressed into encircling relation to the retainingmember I I.

The retaining member H is slightly elongated in form and as viewed inFig. 4 is approximately U-shaped, being formed with an open side whichis of sufiicient width at its rear end to receive the nose of the barrelwhen the member is moved laterally relative to the barrel, and ofsufficient width at its forward'end to receive the shank of the drill 9when the latter is in position in the barrel. To ,hold the memberagainst movement reciprocation of the drill.

For the sake of compactness and ease of assembly of the parts,'the noseI! of the barrel is preferably made of considerably smaller diameterthan the barrel proper and constructed from a separate piece of hardenedsteel which is inserted into the end of the barrel, and which has acentral opening shank of the tool.

l8 (Fig. 3) to receive the To secure the nose piece IT in position, itis formed with a rear threaded portion l9 engaging with internal screwthreads in the end of the barrel.

The nose piece is of integral construction and the groove 14 is formedtherein between'two integral collars 20 and 2|, the collar 20 being of adiameter corresponding approximately with the diameter of the barrel Hi,and the collar 2l'of considerably smaller diameter as determined by thethickness of the wall of the arcuate member |.I as shown clearly in Fig.2. By this construction, the rear portion of the arcuate retainingmember is of a diameter substantially conforming to the diameter of thebarrel, 10.

To enable the nose piece H to be engaged by a wrench or the like, theopposite sides of the collar 20 may be flattened as shown in Fig. 3.

The locking sleeve 12 is slidable' directly on the barrel [8 and has aforward tapered end portion 28 which, in the operative position of thesleeve, encircles the rear end portion of the arcuate retaining memberin closely fitting relation to the outer peripheral surface thereof. Tohold the sleeve yieldably in such operative position, a light coiledspring 22 is provided, and in order that this spring may be positionedaround the barrel, wholly within the sleeve, the latter has its rear endportion counter-bored so as to be slidable over a collar 23 formedintegral with the barrel l9. V for the rear end of the spring 22, and acorresponding opposed shoulder 25 is formed in the sleeve at the forwardend of the counter-bored portion thereof. Said shoulder 25 is formed byan annular flange 25 projecting a short distance inwardly andalsoproviding a shoulder 21 adapted to engage with the rear side of thecollar 20 which, for this purpose, projects slightly beyond the barrelproper. Itwill be understood that the spring is constantly under slightcompression so as to urge the sleeve continuously in a forward directionor into operative or holding relation with respect to the arcuateretaining member I l, the sleeve being limited in such.

movement by the shoulder 2'l'an'd collar 20.

In the'modifled form of the device shown in Fig. 5, the retainingmember,. indicated at 30, has a resilient connection withthe barrel inorder to cushion the shock on the retainingmember of the tool 9 in itsreciprocation. To this end, the nose of the barrel has a two partconstruction, one part 3| being rigidly secured in the barrel and theother part 32 being resiliently supported thereby. The part 3|preferably is threaded into the barrel proper to receive the shank 8 ofthe tool and is provided with a collar. 33 abutting the end of thebarrel and: extending lateral' ly beyond the barrel to providea shoulder34. The resiliently mounted part 32,;comprises a sleeve portion 35surrounding thezendof the barrel, and an end portion 36 provided with anannular groove 31 to receive the inwardly turned flange on the retainingmember, The sleeve portion 35 at its rear end has a collar 38 threadedthereon, and a coiled compression spring 40, enclosed by the Sleeveportion bears against the collar 38 and the shoulder 34 to resilientlyresist outward movement of part 32.

'The locking sleeve, indicated at 4|, in this form of the device, isslidably mounted on the resiliently mounted part 32, so that movement ofthe part 32 will not cause a release of the retaining member. Thelocking sleeve, as in the other form of the device, is urged to aposition holding the retaining member in place by a coiled spring 42enclosed by the locking sleeve. The spring 42 bears at one endagainst'the collar 38 and at the other end against a shoulder 43 formedby an internal flange 44 on the locking sleeve. To prevent the lockingsleeve from being forced off the end of the barrel by the spring 42, theouter face of the internal flange 44 is adapted to abut against anexternal flange 45 on the resiliently mounted part 32. To avoid droppingthe retaining member 30 when it is removed, a short piece of chain 46may be attached thereto and to the barrel, the chain having suflicienfislack to permit the retaining member to be easily Withdrawn. T

This collar 23 provides a shoulder 24 In the operation of inserting orremoving a tool, the operator grasps the sleeve l2 with the fingers ofone hand and slides it rearwardly on the barrel against the action ofthe spring 22 until the tapered forward end portion 28 of the sleeveclears the'retaining member. Thereupon, the said member I I may bereadily withdrawn by the fingers of the other hand from its nose H, todisengage the flange i3 from its groove 54 in the nose. The drill 9 maythen be removed or inserted, as the case may be, and the arcuateretaining member readily slipped back into place with one hand while theother hand holds thesleeve 12 in withdrawn position. Finally, a mererelease by the operator of the sleeve it to the action of the spring 22will result in a movement of the sleeve by the spring into operative orlooking relation with the retaining member. Thus, in this operation,only two movements are required and only two parts necessary to be heldby the operator. In addition, the. construction is exceedingly simpleand yet it has been found to be very efiectual in. retaining the drillin position. Finally it will be observed that the retain ing device doesnot add materially to. the bulk. of the tool at the noseend thereof, andthat. the parts are capable of being easily and cheaply assembled.

In the form of the device shown in Fig. 5, the operation of inserting orremoving the tool is the same as in the form shown in Figs. 1 to 4. Theretaining member 30, however, is supported by the part 32 which isresiliently, supported on the end of the barrel. Thus, when the tool isdriven outwardly in the reciprocation; thereof, the shock on theretaining member is cushioned by the spring 40. The locking sleeve 4|,being mounted on the resiliently mounted part 32, will move with saidpart on any movement thereof involved in the cushioning of the retainingmember, so. that the locking sleeve will not release the retainingmember because of the cushioning movement.

r I claim as my invention;v

1. In a portable power driven tool having a barrel and atoolreciprocable in one end thereof, means for removably retaining'thetool in position in the barrel comprising an arcuate retaining memberhaving inturned flanges at opposite ends for respectivelyengaging thebarrel and the tool, said barrel having a part provided with a groove toreceive one flange of said retaining member, said part being resilientlymounted on the barrel proper to cushion the shock on said retainingmember of the reciprocable movement of the tool, and disengageable meansresiliently urged into locking position for locking the retaining memberin position on the end piece.

2. In a portable power driven tool having a barrel and a toolreciprocable in one end thereof, means for retaining the tool inposition in the barrel comprising an arcuate retaining member havinginturned flanges at opposite ends for respectively engaging the barreland the tool, said barrel having a nose comprisingtwo parts resilientlyconnected, one of said parts being rigid with the barrel proper andshaped to receive the shank of the tool, and the other part having agroove to receive the flange on the retaining member, and disengageablemeans-for locking the retaining member in position on the barrel.

3. In aportable power driven tool having a barrel and a toolreciprocable in one end thereof,

a nose mounted in the end of the barrel com prising two parts, one rigidwith the barrel and the other resiliently carried by the barrel, saidtool and said resilient part respectively having spaced annular grooves,a substantially U-shaped member having inwardly turned flangesengageable with said grooves by a lateral movement of the member, and aslidable locking sleeve surrounding the barrel and normally having oneend encircling the retaining member to hold it in engaged position.

4. In a portable power driven tool having a barrel and a toolreciprocable in one end thereof, means for retaining the tool inposition in the barrel comprising an arcuate member having a pair ofinturned flanges one of which is engageable with said tool, said barrelhaving a nose for positioning the tool in the barrel and including aresiliently mounted part provided with a groove for receiving the otherflange on the retaining member and comprising a sleeve surrounding theend of the barrel, a spring ensaid sleeves and acting therebetween tohold the forward end of said locking sleeve in encircling relation tothe retaining member.

5. In a portable power driven tool having a barrel and a toolreciprocable in one end thereof,

means for retaining the tool in position in the barrel comprising anarcuate retaining member engageable with said tool by a lateralmovement, said barrel having a resiliently mounted part engaged by saidretaining member by the lateral movement thereof and adapted to cushionthe shock on the retaining member of the reciprocable movement of thetool, and means carried by said part for locking the retaining member inposition thereon and on the tool, said means being slidable on said partto release said retaining member,

JOSEPH F. I-IAAS.

